president obama will travel here to boston on thursday for a religious interface service, dedicated to the three people killed in the attack and the more than 180 people injured. we now know the name of another of the three people who died, her name krystle campbell, 29 years old. her mother spoke out a little while ago in tears, saying she and her family are heart broken. we also just learned that the third person who died was a boston university graduate student. investigators here in boston say their hunt for a terrorist -- for a suspect in these terror bombings is still preliminary, and this case, they say, is wide open. >> among items partially recovered are pieces of black nylon, which could be from a backpack, and what appeared to be fragments of bbs, and nails, possibly contained in a pressure cooker device. in addition, this morning, it was determined that both of the explosives were placed in a dark colored nylon bag or backpack. the bag would have been heavy because of the components believed to be in it. >> let's bring in our chief national correspondent john king working h